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Bolt net coal road spraying material

A technology of spraying materials and coal lanes, applied in the direction of coating, etc., can solve the problems of metal anchor mesh corrosion and coal wall weathering in coal lanes in mining areas, and achieve the effects of reducing labor intensity of workers, fast spraying speed, and small springback

Inactive Publication Date: 2010-01-06
兖矿能源集团股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiency that the existing anchor-mesh coal roadway anchor spraying materials cannot solve the problems of coal roadway metal anchor mesh corrosion and coal wall weathering in the mining area, the present invention provides a kind of anchor-mesh coal roadway spraying material, which can greatly improve the prevention of coal roadway support Ability of metal anchor mesh to corrode and coal wall weathering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The seven-mining belt roadway in a mine in Yanzhou mining area is a rectangular anchor mesh roadway excavated along the 3-layer coal roof, with a designed net width of 4.6m and a height of 3.0m. The average coal thickness is 8.47m. The immediate bottom is siltstone and bauxite mudstone, with well-developed fissures and horizontal bedding; gangue (carbonaceous mudstone) is locally developed in the coal seam, which is broken; the false roof of the coal seam is not developed, and the immediate roof is siltstone, mudstone, and muddy cementation. Fractures are more developed, and horizontal and wavy bedding are more.

[0041] Use the composition and ratio of spraying materials in coal roadways in normally closed mining areas to spray, namely:

[0042] Cement: Polyacrylate emulsion: 801 glue: Fly ash: Water reducer: Accelerator=100:3.5:3.5:9:2:1.5.

[0043] The water-cement ratio is 0.5, and the thickness of the sprayed grout is 3-4mm.

[0044] ② Spraying materials in the ...

Embodiment 2

[0048] Mining Area 103 of a mine in Yanzhou Mining Area 上 06 fire-fighting road and medium coal roadway are rectangular bolted roadways excavated along the floor of the third upper coal seam. The design net width is 4.2m and the height is 3.2m. The average thickness of Sanshang Coal is 6.2m. The floor is off-white medium sandstone, hard and compact, with a hardness of f=10; the interbedded siltstone is gray to off-white, with developed oblique bedding and wavy oblique bedding, and the hardness is f=8; the immediate top is dark gray siltstone, with well-developed fractures, compared Broken, accompanied by small showers, hardness f=4~6.

[0049] Use the composition and ratio of spraying materials in the environment of small water spraying in coal lanes, namely:

[0050] Cement: Polyacrylate emulsion: Silicon fume: Fly ash: Water reducer: Accelerator=100:4:2:8:3:1.5.

[0051] Water cement ratio = 0.35 ~ 0.5, spray layer thickness 1.5 ~ 5mm.

[0052] ③ Spraying materials in t...

Embodiment 3

[0056] In the seven-mining belt roadway in the above-mentioned embodiment 1, that is, in the rectangular anchor mesh roadway excavated along the 3-layer coal roof, there are some roadway sections with developed cracks, severe roof breakage, many faults, and relatively large horizontal bedding and wavy bedding. many. Use the composition and proportion spraying under the complex geological structure of the coal roadway, namely:

[0057] Cement: Polyacrylate emulsion: Silica fume: Water reducer: Accelerator: Sand=100:5:2.5:1.5:3:10.

[0058] Explanation: ① The present invention is particularly suitable for application in coal roadways in mining areas, and can also be used in other coal roadways. ②The above-mentioned embodiment is an individual case. Depending on the conditions of the coal roadway, adjustments can be made within the range of the corresponding three components and the proportioning ratio according to the specific situation. ③Under the above three conditions, the ...

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Abstract

The invention relates to a bolt net coal road spraying material which is added with polyacrylate emulsion and modified on the basis of components such as cement, water reducing agent and accelerating agent. The spraying material can be separately added with 801 adherent and fly ash, silica powder and fly ash, and silica powder and sand for three different injection conditions, namely the normal enclosed environment, small water pouring environment and complicated geological structure environment of the coal road to increase the mechanical properties and using effects. The spraying material has high adhesive strength to the coal wall and the bolt net, high elongation ultimate, high tensile strength, low tensile elastic modulus, small shrinkage, much higher crack resistance, high permeability resistance and much higher compactibility, the spraying material can protect the internal bolt net from erosion and obviously slower the corrosive velocity; the spraying material has good ageing resistance and can reach the aim of delaying the corrosion of the bolt net and the coal wall. In addition, the spray layer is thin and uniform, the construction speed is quick, and the resilience rate, the dust concentration and the cost are low.

Description

technical field [0001] The invention relates to the field of bolt-spray support for mine roadways, in particular to a bolt-mesh coal roadway spraying material suitable for anchor-mesh support of coal roadways in coal mining areas to prevent metal anchor mesh corrosion and coal wall weathering. Background technique [0002] With the rapid development of mining technology, the total amount of anchor net support in coal mines has accounted for 80% of coal mine support roadways. At present, dry-sprayed ordinary cement mortar or ordinary concrete is used for the anchor net support of the coal roadway in the mining area, and its material composition and ratio are as follows: [0003] The material composition and ratio of ordinary cement mortar are: cement: sand: quick-setting agent: water reducer = 1: 2-2.5: 0.03-0.05: 0.03-0.04. The water-cement ratio is 0.4-0.5. [0004] The material composition and ratio of ordinary concrete are: cement: sand: gravel: quick-setting agent: wat...

Claims

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Application Information

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IPC IPC(8): C09D133/08C04B28/00C04B24/26
Inventor 张震贾宏俊李付臣初明祥李建华魏忠民
Owner 兖矿能源集团股份有限公司
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